I had an extremely weird trouble with latencies particularly servers in the EU and the US. More often than not that starts with a latency of 290ms to servers in the US. After an hour - perhaps less or more, little by little this latency will boost by about 100 ms 370-390ms to say.
Now if I re-connect several times using different DNS servers for my Internet connection marker is a high probability that the latency is back to normal after about 4-5 attempts. my ping where latency was terrible then cut off and reconnect twice to return to normal latency
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